| Meaning | Category |
| Half Duplex Interface | Computing->Networking |
| Hard Drive Indicator | Computing->Hardware |
| Harley Davidson International | Business->Firms |
| Harley Davidson, Inc. | Business->NYSE Symbols |
| Head To Disk Interference | Governmental->Military |
| Health Development International | Community->Non-Profit Organizations |
| Help Desk Internal | Computing->General |
| Hexamethylene Di Isocyanate | Academic & Science->Chemistry |
| High Definition Imaging | Community->Media |
| High Density Interconnection | Internet |
| Hitachi Debugging Interface | Computing->Software |
| Host Defenses And Infection | Medical->Physiology |
| Human Development Index | Community->Educational |
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